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Humidity Devices
objectives and critical thinking
23
Health Care
Undergraduate 2
09/25/2011

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Cards

Term
What are the limitations of a hme?
Definition
1. Most barely provide the minimum recommended humidity needed for a patient wih a bypassed airway
2. Use only 96 hours
3. Not to be used for patients that are febrile, dehydrated, min ve over 10LPM due to risk of thick secretions
Term
Advantages of a HMEw
Definition
Cost & Labor savings less circuit changes elimination of need to drain tubing condensate
Eliminate possible airway burn from excessive humidifier temperatures
Reduced risk of nos. inf.
HMEF's(filter) additional filtration of inhaled air
Term
what effect does moisture have on HME function?
Definition
Saturation of the HME will lead to increased resistance across the HME
Term
What is the most efficient humidifier high flow?
Definition
Heated Wick
Term
What is the most efficient low flow humidifier
Definition
bubble diffuser
Term
what effect does temperature have on the unit?
Definition
as temperature increases, the absolute humidity of gas increases
Term
AARC guidelines for minimum water vapor content (mg/L) that must be provided to patients with artificial airways?
Definition
30 mg/L
Term
Advantages of a continuous feed system to fill a humidifier
Definition
decrease risk of nosocomial infections, no need to fill it, which results in saved labor cost
Term
what are the disadvantages of using a continuous feed system to fill a humidifier
Definition
Accidental flooding of unit or it can run dry if feed system fails.
More expensive
Term
Define Humidity
Definition
Amount of water vapor content of a gas, sometimes called water vapor
Term
Absolute Humidity
Definition
The actual content or weight of water present in a given volume of gas and may be expressed g/m3 or mg/L
Term
Relative Humidity
Definition
Content / Capacity
comparison of gas sample with its maximum amount that the gas can hold at a given temp
Term
Body Humidity
Definition
the maximum amt of water that can be held by a gs at body temperature
Term
Body humidity deficit
Definition
BH= Cap - Cont
difference between the amount of water inspired and water vapor contained in the gas in the lungs
Term
Vapor
Definition
individual free molecules of a substance that exists below its critical temp
Term
Water vapor tension (pressure)
Definition
varies with temp. temp increases so does pressure due to kinetic activity of the gas molecules
Term
BHD
Definition
43.8
Term
PH2O water vapor pressure at 37o C
Definition
47 torr
Term
factors affection water
Definition
Term
factors affecting water vapor pressure
Definition
the normal values are found in gas in the lower resp track as a result of effect upper and lower airway conditioning process for incoming gas from a wide range of ambient conditions
Term
Indications of Humidity Therapy
Definition
Administration of medical gases from a cylinder or pipeline
environmental relative humidity of less than 40% in a patien without lung disease and less than 70% in a patient with lung disease
Term
Therapeutic value of humidifers
Definition
Takes dry gases and brings them to room air to prevent airway from drying out
Term
Jet Humidifier
Definition
Uses Bernoulli's principle
Gas exits at a high velocity creating a drop in lateral pressure water is drawn up capillary tube, as it leaves the cap tube it is broken by the gas in to an aerosol, which then evaporates to humidify the gas
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